File 0006-Grow-Add-documentation-to-abort_reshape-for-suspend_.patch of Package mdadm.7129

From bf08f6b1efed94b80c4cfb433db7202b6b7f794c Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Mon, 22 Feb 2016 09:43:43 -0500
Subject: [PATCH 227/359] Grow: Add documentation to abort_reshape() for
 suspend_{lo,hi} setting
References: bsc#1081910

Add documentation for quirky reset procedure for resetting suspended
region range.

Suggested-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 Grow.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Grow.c b/Grow.c
index bbdd46c..c4f417e 100755
--- a/Grow.c
+++ b/Grow.c
@@ -740,6 +740,14 @@ int start_reshape(struct mdinfo *sra, int already_running,
 void abort_reshape(struct mdinfo *sra)
 {
 	sysfs_set_str(sra, NULL, "sync_action", "idle");
+	/*
+	 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
+	 * suspend_hi to decrease as well as increase.")
+	 * you could only increase suspend_{lo,hi} unless the region they
+	 * covered was empty.  So to reset to 0, you need to push suspend_lo
+	 * up past suspend_hi first.  So to maximize the chance of mdadm
+	 * working on all kernels, we want to keep doing that.
+	 */
 	sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
 	sysfs_set_num(sra, NULL, "suspend_hi", 0);
 	sysfs_set_num(sra, NULL, "suspend_lo", 0);
-- 
2.16.1